FR2817933A1 - FRICTION CLUTCH - Google Patents

Abstract

Friction clutch intended for a transmission line of a motor vehicle comprising an input part (2), a clutch housing (3), at least one clutch disc (6) cooperating with an output element and a pressure plate (5) cooperating with the input part and which, under the action of an energy accumulator (7), acts to transmit a torque to the clutch disc. The entry piece (2) comprises an external radial zone with a radial wall (8) occupying at least a partial zone of the periphery to cooperate with the pressure plate (5).

Description

The present invention relates to a friction clutch for a line

  for the transmission of a motor vehicle, comprising an input part, a clutch housing, at least one disc

  clutch cooperating with an output element, and a pressure plate

  co-operating with the entry room and which, under the action of an accumu-

  energy generator, acts to transmit torque to the clutch disc.

  According to document DE 195 45 972 A1, there is known a

  friction clutch with several discs, the different clutch discs of which are made in the form of a lamella part connected by a hub part. In the clutch housing, there is a plate

  pressure applied by a force accumulator; multiple discs

  intermediaries are integrally connected in rotation to the clutch housing.

  These intermediate discs penetrate each time between two lamellae.

  The force accumulator makes it possible to press against each other

  intermediate discs and lamellae to create a friction contact

  reciprocal. The force accumulator, produced in the form of a membrane spring, is located inside the casing essentially parallel

  at the bottom of the housing so that it can be supported, on the one hand, against the housing

  ter and, on the other hand, against the pressure plate and thus create the force

of application necessary.

  The difficulty of such a friction clutch is that of the cooling air supply inside the clutch with the consequence that there is at least the risk of overheating the clutch.

  if the latter works for a long time in skating mode.

  In addition, in this known friction clutch, there is the diffi-

  aware that the housing requires a complicated manufacturing procedure to

  many stages. The object of the present invention is to develop an em-

  friction clutch for better cooling air supply

  heating components and also more manufacturing

  interesting separate rooms.

  To this end, the invention relates to a friction clutch of the type defined above, characterized in that the input part comprises on an external radial zone an axial wall occupying at least a partial zone of the periphery to cooperate with the pressure plate. In addition, in this friction clutch according to the invention, the wall is stepped

in the peripheral direction.

  By this means, the construction of the friction clutch

  especially when using sheet metal parts, is economical and necessary

site few steps for mounting.

  One can for example provide that the axial wall comprises a fixing segment with the help of which it is connected to the casing. The casing can also be connected by means of attachment to the wall. The means to be used for assembling the friction clutch are particularly simple, and the friction clutch, in particular the input part with the housing, is stiffened if the housing is preferably supported.

  against the axial wall because this results in relatively eco-friendly centering

  of the two rooms. The moment of inertia of the reduced mass is re-

  significantly decreases here if the axial wall has, at least in one

  part, cut segments corresponding to a different axial extension

annuity.

  Preferably, in an embodiment according to the invention, the part

  King of a fastening segment close to the base body of the entry piece is provided to cooperate with a fastening means and, moreover, the fastening segment continues axially by an elastic biasing zone of the fastening means. This allows, on the one hand, to increase the rigidity of the entry piece relative to the screen and, on the other hand, the effect of force

  centrifugal on the axial wall remains reduced because the fixing segment decreases

  bare the flexural stresses produced by the centrifugal force at the base of the axial wall and, at the same time, the fixing means can be prestressed in a controlled manner if these can deform elastically in a certain axial area. For cost reasons and to reduce the means of manufacturing the entry piece, it

  is proposed to make this area on the wall. In addition, in the event of solicitation-

  elasticity of the fastening means, it is also necessary to have a

  elastic formation of the housing in the fixing zone. For this, at the level of the fixing means, the casing is produced so that its support is on the input part and the casing deforms elastically at least in the axial direction, to increase mounting security and reduce the rate of defective assemblies. For this, the casing has a curved part in the zone of contact with the fixing means, this curved zone being turned in the direction opposite to the fixing direction;

  alternatively, the entry piece may include a cavity in this area.

  The casing preferably rests against the front face of the axial wall and these front faces can be provided in the direction

  device, on both sides of the fixing area.

  To obtain a rotational coupling between the inlet part and the pressure plate, several spaced apart, directed guide surfaces

  in the peripheral direction, are provided on the entry piece, and the

  axial king is, at least in part, distributed in the peripheral direction.

  The guide surfaces then cooperate with the pressure plate. This achievement on the one hand makes the axial wall stable and on the other hand reduces the

  o0 number of parts of the friction clutch to a minimum number.

  The pressure plate has radial extensions

  to engage with the walls, which allows to transmit my-

  simple a partial range of torque from the input part to the pressure plate and the latter remains axially movable relative to the part

input.

  To transmit as high a power as possible

  and as high a torque as possible by the friction clutch, it is pro-

  installed another clutch disc and an intermediate disc: the intermediate disc has radial extensions to engage

  in the axial walls of the entry room.

  The operation of the friction clutch, in particular for clutch and declutching operations, is particularly advantageous if the pressure plate or the intermediate disc has

  each time the first radial extensions to transmit my-

  remarkable torque in the engaged state and the second radial extensions to guide the pressure plate or the intermediate disc

  during the clutch operation. Both the pressure plate and the

  that intermediate can include the extensions mentioned above and thus advantageously produce first and second extensions

  on the pressure plate and the intermediate disc, so that

  dante. To reduce the tensions linked to the centrifugal force, the casing has an external zone cooperating with a centering segment of

  Wall. This allows in particular to ensure in a particular way-

  simple centering of the housing and the input part with respect to

the common axis of rotation.

  The construction of the entrance room can be adapted to

  transmit to the high torque, in that the input part has more

  successive segments in the peripheral direction with an axial wall and the segments between the end zones directed towards the direction

  peripheral, have end zones presenting a cutting of ma-

  to reduce the effect of centrifugal force. The manufacturing of the entry piece is particularly economical if the material extension extends

  at least in the end zone on the side of the housing of the axial wall.

  This allows definitive shaping without difficulty of the part in

cast iron after solidification.

  The present invention will be described below in more detail using the various embodiments shown in the accompanying drawings in which: - Figure 1 is a perspective view of a friction clutch, - Figure 2 is a view of an entry piece, - Figure 3 shows the housing, - Figure 4 shows a detail of the side view of the entry piece,

  - Figure 5 is a perspective view of a pressure plate.

  According to FIG. 1, the friction clutch 1 mainly consists

  cipally of an inlet part 2 fixed by flanges on the crankshaft of an internal combustion engine and to which is fixed frontally a casing 3 whose axial side receives a diaphragm 21, mounted pivotally, by means of studs d 'spacing 20. This diaphragm 21 acts on the

  pressure plate 5, by knife-shaped edges formed thereon

  ci and press the plate in the engaged state against the clutch disc.

  The connection of the casing 3 shown in Figure 3 and the part

  input 2 is done by fixing means 10, here screws. These screws cross

  feels the fixing holes in tabs located radially outside the casing 3 and their threaded part comes to take in the fixing segment 12 of the inlet part 2. This fixing segment 12 is provided with a thread complementary to that of the fixing means 10. In the

  zone in which the casing 2 is pressed against the input part 2, the

  prestressing speed 19 of the input part 2 under the housing zone 3 if-

  killed under the support area of the screw head, produces a deformation

  elastic. In the axial direction, the preload cavity 13 can

  follows by an area in which the fixing means 10 can be elastically elongated and is not in PTO or shape with the entry piece 2 before the fixing means comes into the fixing segment. The input part 2 comprises, on its side facing the casing 3, several walls 8 directed axially. These walls distributed around the periphery

  are made so that the first radial extensions 16 and the

  radial extension conds 17 of the pressure plate 5 or of the intermediate disc 6 penetrate. The first radial extensions 16 transmit the torque from the input part 2 to the pressure plate 5 or to the intermediate disc 6 and the second radial extensions 17 resume, during the engagement and disengagement operation, the guidance in the axial direction . Between the second radial extensions 17 and

  the guide surfaces 15 of the input part 2, it is possible to use elements

elastic sliding elements.

  According to FIG. 2, the entry room 2 has 9 walls 8

  parts axially in the peripheral direction. These walls are axially directed and form, by guide surfaces 15, each time cutouts 11 to cooperate with the radial extensions 16, 17 of the pressure plate 5 and the intermediate disc 6. The cutouts 1 1 are

  distributed so that each time 3 of these are distributed

  equiangular and cooperate with the second radial extensions 17 for guiding during a clutch or declutching operation; each time we have 6 cuts 11 to receive the first extensions

  radial 16 for torque transmission. The 6 cutouts 11 are re-

  parts so as to be associated each time in pairs between each time 2 cutouts 1 1 provided for the two radial extensions 17. The walls

  8 axially directed join from their base an annular boss

  peripheral area. This annular boss projects beyond the friction surface 22 only so that in the engaged state, this surface does not

  not in contact with the radial extensions 16, 17 when the packings

  clutch disc friction res have reached their maximum wear condition

  mum allowed. An axial segment 24 joins its base by a rounding with an annular boss; the attachment segment 12 is produced by two branches 23 each forming a front face 14. The axial segments 24 form the guide surfaces 15 directed in the peripheral direction to cooperate with radial extensions 16, 17 of the pressure plate 5 and the intermediate disc 6. The cutting of material 19 is delimited by the two branches 23 and the fixing segment 12

  an axial segment 24; the casing 3 comes to bear against the front faces

  the 14 and the fixing means 10 arrives in the fixing segment 12 to

through the material cut 19.

  FIG. 4 shows an alternative embodiment in the form of a cutout between the axial wall 8 and the casing 3. The entry piece 2 is

  performed as in the embodiment of Figure 3. However, con-

  trairement to this embodiment, the housing 3 has in its outer radial end region cooperating with the fixing means 10, a

  peripheral centering segment 18, which surrounds the outer radial zone

  lower branches 23. Although this preferably serves better to center the casing 3 relative to the input part 2, with respect to the common axis of rotation, in this way it can reduce the stress on the

  axial segments 24 by centrifugal force.

  Figure 5 shows by way of example an embodiment of a

  pressure plate 5 with each a first and a second extension

  radial element 16, 17 which cuts the raised pressure plate each time

  in the axial direction to be stressed by the force accumulator 7.

  In this case, an embodiment of an intermediate disc 6 given by way of example corresponds in a similar manner to the realization of the tray of

  pressure 5 without the knife edge of the pressure plate.

NOMENCLATURE

  1 Friction clutch 2 Input part 3 Housing Pressure plate 6 Intermediate disc 7 Energy accumulator 8 Axial wall 10 Fixing means 1 1 Cavity 12 Fixing segment 14 Front face Surface area in the peripheral direction (guide surface ) 16 First radial extensions 17 Second radial extensions 18 Centering segment 19 Material cutting - Prestressing cavity Spacer studs 21 Diaphragm 22 Friction surface 23 Branch

24 Axial segment.

Claims (19)

  1) Friction clutch intended for a transmission line of a motor vehicle, comprising an input part (2), a clutch housing (3), at least one clutch disc (6) cooperating with an element output, and a pressure plate (5) cooperating with the input part and which, under the action of an energy accumulator (7), acts to transmit a torque to the clutch disc, characterized in that that the entry piece (2) has a wall on an external radial zone   axial (8) occupying at least a partial zone of the periphery for coo-   macerate with the pressure plate (5).   2) Friction clutch according to claim 1, characterized in that   the wall (8) is stepped in the peripheral direction.   3) Friction clutch according to claim 1, characterized in that   the wall (8) comprises a fixing segment (12) connecting it to the casing (3).   4) Friction clutch according to claim 3, characterized in that   the casing (3) is connected to the wall (8) by fixing means (10).   5) Friction clutch according to claim 3, characterized in that   the casing (3) mainly rests against the axial wall (8).   6) Friction clutch according to claim 1, characterized in that the axial wall (8) comprises at least on one part, segments (24) of different axial extension.   7) Friction clutch according to claim 1, characterized in that the wall (8) comprises a fixing segment (12) close to the base body   of the input part (2) to cooperate with a fixing means (10).   8) Friction clutch according to claim 7, characterized in that the fixing segment (12) continues axially by a zone (13) for   resiliently bias the fixing means (10).   9) A clutch according to claim 8, characterized in that   the area (13) is formed on the wall (8).   10) Friction clutch according to claim 8, characterized in that   the elastic stress of the fixing means (10) produces a deformation   elastic position of the casing (3) in the fixing zone.   11) Friction clutch according to claim 1, characterized in that   the casing (3) bears against the front face (14) of the wall (8).   12) A clutch according to claim 1, characterized in that the input part (2) has several guide surfaces (15) spaced   in the peripheral direction and extending axially.   13) Friction clutch according to claim 1, characterized in that   the axial wall (8) extends partly in the peripheral direction.   14) Friction clutch according to claim 12, characterized in that   the guide surfaces (15) cooperate with the pressure plate (5).    ) Friction clutch according to claim 12, characterized in that the pressure plate (5) has radial extensions (16, 17)   to engage with the walls (8).   16) Friction clutch according to claim 1, characterized in that the friction clutch comprises at least one other clutch disc and an intermediate disc (6).   17) Friction clutch according to claim 16, characterized in that the intermediate discs (6) have radial extensions (16,   17) to engage with the walls.   18) Friction clutch according to claim 15, 1o characterized in that   the pressure plate (5) or the intermediate disc (6) includes pre-   better radial extensions (16) to mainly transmit the torque in the engaged state, and the second radial extensions (17) to guide the pressure plate or the intermediate disc during the clutch operation.   19) Friction clutch according to claim 3, characterized in that the housing (3) has an outer zone which cooperates with a segment of centering (18) of the wall.    ) Friction clutch according to claim 1, characterized in that the input part (2) comprises several successive segments (24) in the   peripheral direction and having an axial wall (8).   21) Friction clutch according to claim 20, characterized in that the segments (24) between the end zones turned in the direction   peripheral have a material cutout (19) to reduce the central force   trifuge. 22) Friction clutch according to claim 21, characterized in that the material cutout (19) extends at least in the axial zone   end of the axial wall (8), on the side of the casing.